Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 116)

MFJ-1278B MULTI-MODE BASIC OPERATION
After entering the SSTV mode and you have properly selected the correct TV format, type:
K
to leave command mode and enter the CONVERSE mode. Once in CONVERSE mode the
MFJ-1278B is in standby-receive mode. This means that the MFJ-1278B is listening to the
radio for the synchronization signal at the beginning of each SSTV picture. If the MFJ-
1278B hears the synchronization signal well enough, it will establish a lock onto the signal.
Once the signal is locked in MFJ-1278B will display a "!". A "!" indicates that a lock on
the signal is established and MFJ-1278B begins to decode the signal. Once decoding is
completed, the printer attached to the MFJ-1278B will begin to print the captured SSTV
picture.
The MFJ-1278B detects the beginning of each picture before starting to print. This insures
each picture will be printed from top to bottom. If you want the printer to start to print in
the middle of the picture, you may force printing to begin at any time by typing the letter "L"
while in the SSTV standby-receive mode.
If you notice spaces in the printed picture, you should set GRAPHLF to OFF. The
GRAPHLF command determines whether the MFJ-1278B will issue a line feed before the
carriage return on each line of graphics. The default for GRAPHLF is OFF. For most
printers GRAPHLF should be turned ON.
If the picture printed appears to be distorted in large black areas, you should make sure that
the command TVHSYNC is set to OFF. The default for TVHSYNC is OFF. For most
SSTV receiving TVHSYNC should be turned OFF.
The 4 level SSTV pictures received by the MFJ-1278B thru the built-in parallel printer port
can be adjusted for brightness and contrast by using the TVBREAKS command. The
TVBREAKS command controls the brightness and contrast of the SSTV received on the
MFJ-1278B printer port as well as when SSTV picture is printed to the screen. SSTV
pictures sent to the MFJ-1278B printer port are set at 4 gray-levels. With terminal software
which supports multi-gray levels SSTV you can receive SSTV pictures with up to 16 levels
of gray.
The MFJ-1278B can be set to operate SSTV both in Color and 16 gray levels by turning the
command 16LEVELS ON and the command 8LEVELS OFF.
If your terminal program does not support 16 gray levels, the 16Levels command must be
turned off and you must follow the instruction given by your terminal program to operate
SSTV. If your terminal program does not support SSTV you must follow the instructions
given in the main MFJ-1278B manual to operate SSTV thru its built-in printer port.